Thames Water said the power failure combined with high demand during the sustained heatwave meant water could not be pumped to customers fast enough.

During the shortage, Thames Water has handed out bottled water at Grayswood Village Hall and Haslemere Leisure Centre, where some residents told SurreyLive they wanted a temporary hosepipe ban so water levels in the Blackdown Reservoir could recover.

The spokesman said: "We're sorry to customers to customers who may still be experiencing no water or low pressure in GU27.

"Following the power failure at Blackdown Reservoir earlier this week, we've been working hard to stabilise the water pressure in the area but due to very high demand and the continued dry weather we're experiencing some further issues particularly at peak times.

Water bottles in the back of one Haslemere family's car, with empties on the left. (Image: Chris McKeon)

"We're working hard to get everything back to normal as quickly as possible but we do need our customers' help.

"If they can reduce their water usage, by taking simple steps such as not watering their garden using sprinklers or hoses, taking shortage showers instead of baths and not washing their cars, this will help us recover our storage levels and ensure there's enough water to go around."

He added that while the company was not currently considering asking for a hosepipe ban or temporary usage ban, these would become more likely if demand did not decrease.

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This advice does not only apply to residents in Haslemere, but to those in the surrounding area as well even if they are not currently suffering from a water shortage.

Water problems were also reported in parts of Cranleigh on Saturday morning (July 7), which Thames Water said was likely due to the "knock-on effect" of the power outage at Blackdown earlier in the week, which required water to be diverted from elsewhere.